Steps to reproduce:

$ xrandr --listproviders
Providers: number : 2
Provider 0: id: 0x64 cap: 0xb, Source Output, Sink Output, Sink Offload crtcs:
3 outputs: 2 associated providers: 1 name:Intel
Provider 1: id: 0x3f cap: 0x5, Source Output, Source Offload crtcs: 0 outputs:
0 associated providers: 1 name:nouveau

$ xrandr --setprovideroffloadsink nouveau Intel

$ DRI_PRIME=1 glxinfo | grep "OpenGL vendor string"
[segfault]

I'm running kernel 3.14 on Fedora 20, with Xorg 1.14.4,
xf86-video-nouveau-1.0.9, Mesa 10.0.4. Logs are attached below.